<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html lang="en" dir="ltr" class="client-nojs">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>C++ standard libraries extensions - cppreference.com</title>
<meta charset="UTF-8">
<meta name="generator" content="MediaWiki 1.21.2">


<link rel="shortcut icon" href="../../../favicon.ico">



<link rel="stylesheet" href="../../../common/ext.css">
<meta name="ResourceLoaderDynamicStyles" content="">
<link rel="stylesheet" href="../../../common/site_modules.css">
<style>a:lang(ar),a:lang(ckb),a:lang(fa),a:lang(kk-arab),a:lang(mzn),a:lang(ps),a:lang(ur){text-decoration:none}#toc{display:none}.editsection{display:none}
/* cache key: mwiki1-mwiki_en_:resourceloader:filter:minify-css:7:472787eddcf4605d11de8c7ef047234f */</style>

<script src="../../../common/startup_scripts.js"></script>
<script>if(window.mw){
mw.config.set({"wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"cpp/experimental/lib_extensions","wgTitle":"cpp/experimental/lib extensions","wgCurRevisionId":80151,"wgArticleId":13683,"wgIsArticle":true,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":[],"wgBreakFrames":false,"wgPageContentLanguage":"en","wgSeparatorTransformTable":["",""],"wgDigitTransformTable":["",""],"wgDefaultDateFormat":"dmy","wgMonthNames":["","January","February","March","April","May","June","July","August","September","October","November","December"],"wgMonthNamesShort":["","Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"],"wgRelevantPageName":"cpp/experimental/lib_extensions","wgRestrictionEdit":[],"wgRestrictionMove":[]});
}</script><script>if(window.mw){
mw.loader.implement("user.options",function(){mw.user.options.set({"ccmeonemails":0,"cols":80,"date":"default","diffonly":0,"disablemail":0,"disablesuggest":0,"editfont":"default","editondblclick":0,"editsection":0,"editsectiononrightclick":0,"enotifminoredits":0,"enotifrevealaddr":0,"enotifusertalkpages":1,"enotifwatchlistpages":0,"extendwatchlist":0,"externaldiff":0,"externaleditor":0,"fancysig":0,"forceeditsummary":0,"gender":"unknown","hideminor":0,"hidepatrolled":0,"imagesize":2,"justify":0,"math":1,"minordefault":0,"newpageshidepatrolled":0,"nocache":0,"noconvertlink":0,"norollbackdiff":0,"numberheadings":0,"previewonfirst":0,"previewontop":1,"quickbar":5,"rcdays":7,"rclimit":50,"rememberpassword":0,"rows":25,"searchlimit":20,"showhiddencats":0,"showjumplinks":1,"shownumberswatching":1,"showtoc":0,"showtoolbar":1,"skin":"cppreference2","stubthreshold":0,"thumbsize":2,"underline":2,"uselivepreview":0,"usenewrc":0,"watchcreations":0,"watchdefault":0,"watchdeletion":0,
"watchlistdays":3,"watchlisthideanons":0,"watchlisthidebots":0,"watchlisthideliu":0,"watchlisthideminor":0,"watchlisthideown":0,"watchlisthidepatrolled":0,"watchmoves":0,"wllimit":250,"variant":"en","language":"en","searchNs0":true,"searchNs1":false,"searchNs2":false,"searchNs3":false,"searchNs4":false,"searchNs5":false,"searchNs6":false,"searchNs7":false,"searchNs8":false,"searchNs9":false,"searchNs10":false,"searchNs11":false,"searchNs12":false,"searchNs13":false,"searchNs14":false,"searchNs15":false,"gadget-ColiruCompiler":1});;},{},{});mw.loader.implement("user.tokens",function(){mw.user.tokens.set({"editToken":"+\\","patrolToken":false,"watchToken":false});;},{},{});
/* cache key: mwiki1-mwiki_en_:resourceloader:filter:minify-js:7:ca03345b1e2c4d90a25d968753a73b92 */
}</script>
<script>if(window.mw){
mw.loader.load(["mediawiki.page.startup","mediawiki.legacy.wikibits","mediawiki.legacy.ajax"]);
}</script>
<style type="text/css">/*<![CDATA[*/
.source-cpp {line-height: normal;}
.source-cpp li, .source-cpp pre {
	line-height: normal; border: 0px none white;
}
/**
 * GeSHi Dynamically Generated Stylesheet
 * --------------------------------------
 * Dynamically generated stylesheet for cpp
 * CSS class: source-cpp, CSS id: 
 * GeSHi (C) 2004 - 2007 Nigel McNie, 2007 - 2008 Benny Baumann
 * (http://qbnz.com/highlighter/ and http://geshi.org/)
 * --------------------------------------
 */
.cpp.source-cpp .de1, .cpp.source-cpp .de2 {font: normal normal 1em/1.2em monospace; margin:0; padding:0; background:none; vertical-align:top;}
.cpp.source-cpp  {font-family:monospace;}
.cpp.source-cpp .imp {font-weight: bold; color: red;}
.cpp.source-cpp li, .cpp.source-cpp .li1 {font-weight: normal; vertical-align:top;}
.cpp.source-cpp .ln {width:1px;text-align:right;margin:0;padding:0 2px;vertical-align:top;}
.cpp.source-cpp .li2 {font-weight: bold; vertical-align:top;}
.cpp.source-cpp .kw1 {color: #0000dd;}
.cpp.source-cpp .kw2 {color: #0000ff;}
.cpp.source-cpp .kw3 {color: #0000dd;}
.cpp.source-cpp .kw4 {color: #0000ff;}
.cpp.source-cpp .co1 {color: #909090;}
.cpp.source-cpp .co2 {color: #339900;}
.cpp.source-cpp .coMULTI {color: #ff0000; font-style: italic;}
.cpp.source-cpp .es0 {color: #008000; font-weight: bold;}
.cpp.source-cpp .es1 {color: #008000; font-weight: bold;}
.cpp.source-cpp .es2 {color: #008000; font-weight: bold;}
.cpp.source-cpp .es3 {color: #008000; font-weight: bold;}
.cpp.source-cpp .es4 {color: #008000; font-weight: bold;}
.cpp.source-cpp .es5 {color: #008000; font-weight: bold;}
.cpp.source-cpp .br0 {color: #008000;}
.cpp.source-cpp .sy0 {color: #008000;}
.cpp.source-cpp .sy1 {color: #000080;}
.cpp.source-cpp .sy2 {color: #000040;}
.cpp.source-cpp .sy3 {color: #000040;}
.cpp.source-cpp .sy4 {color: #008080;}
.cpp.source-cpp .st0 {color: #008000;}
.cpp.source-cpp .nu0 {color: #000080;}
.cpp.source-cpp .nu6 {color: #000080;}
.cpp.source-cpp .nu8 {color: #000080;}
.cpp.source-cpp .nu12 {color: #000080;}
.cpp.source-cpp .nu16 {color:#000080;}
.cpp.source-cpp .nu17 {color:#000080;}
.cpp.source-cpp .nu18 {color:#000080;}
.cpp.source-cpp .nu19 {color:#000080;}
.cpp.source-cpp .ln-xtra, .cpp.source-cpp li.ln-xtra, .cpp.source-cpp div.ln-xtra {background-color: #ffc;}
.cpp.source-cpp span.xtra { display:block; }

/*]]>*/
</style>
<!--[if lt IE 7]><style type="text/css">body{behavior:url("/mwiki/skins/cppreference2/csshover.min.htc")}</style><![endif]-->
</head>
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_lib_extensions skin-cppreference2 action-view cpp-navbar">
        <!-- header -->
        
        <!-- /header -->
        <!-- content -->
        <div id="cpp-content-base">
            <div id="content">
                <a id="top"></a>
                <div id="mw-js-message" style="display:none;"></div>
                                <!-- firstHeading -->
                <h1 id="firstHeading" class="firstHeading">C++ standard libraries extensions</h1>
                <!-- /firstHeading -->
                <!-- bodyContent -->
                <div id="bodyContent">
                                        <!-- tagline -->
                    <div id="siteSub">From cppreference.com</div>
                    <!-- /tagline -->
                                        <!-- subtitle -->
                    <div id="contentSub"><span class="subpages">&lt; <a href="../../cpp.html" title="cpp">cpp</a>‎ | <a href="../experimental.html" title="cpp/experimental">experimental</a></span></div>
                    <!-- /subtitle -->
                                                            <!-- bodycontent -->
                    <div id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr">
<div class="t-navbar" style="">
<div class="t-navbar-sep"> </div>
<div class="t-navbar-head">
<a href="../../cpp.html" title="cpp"> C++</a><div class="t-navbar-menu"><div>
<div><table class="t-nv-begin" cellpadding="0" style="line-height:1.1em;">
<tr class="t-nv"><td colspan="5"> <a href="../language.1.html" title="cpp/language"> Language</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../header.html" title="cpp/header"> Standard library headers</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../concept.html" title="cpp/concept"> Concepts</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../utility.html" title="cpp/utility"> Utilities library</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../string.html" title="cpp/string"> Strings library</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../container.html" title="cpp/container"> Containers library</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../algorithm.html" title="cpp/algorithm"> Algorithms library</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../iterator.html" title="cpp/iterator"> Iterators library</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../numeric.html" title="cpp/numeric"> Numerics library</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../io.html" title="cpp/io"> Input/output library</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../locale.html" title="cpp/locale"> Localizations library</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../regex.html" title="cpp/regex"> Regular expressions library</a> <span class="t-mark-rev t-since-cxx11">(C++11)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../atomic.html" title="cpp/atomic"> Atomic operations library</a> <span class="t-mark-rev t-since-cxx11">(C++11)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../thread.html" title="cpp/thread"> Thread support library</a> <span class="t-mark-rev t-since-cxx11">(C++11)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../experimental.html" title="cpp/experimental"> Technical Specifications</a> </td></tr>
</table></div>
<div></div>
</div></div>
</div>
<div class="t-navbar-sep"> </div>
<div class="t-navbar-head">
<a href="../experimental.html" title="cpp/experimental"> Technical specifications</a><div class="t-navbar-menu"><div>
<div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="fs.html" title="cpp/experimental/fs">Filesystem library</a> <span class="t-mark-rev t-since-fs-ts t-mark-ts">(filesystem TS)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <strong class="selflink">Library fundamentals</strong> <span class="t-mark-rev t-since-libfund-ts t-mark-ts">(library fundamentals TS)</span>
</td></tr>
<tr class="t-nv"><td colspan="5"> <a href="lib_extensions_2.html" title="cpp/experimental/lib extensions 2">Library fundamentals 2</a> <span class="t-mark-rev t-since-libfund-2-ts t-mark-ts">(library fundamentals 2 TS)</span>
</td></tr>
<tr class="t-nv"><td colspan="5"> <a href="parallelism.html" title="cpp/experimental/parallelism">Extensions for parallelism</a> <span class="t-mark-rev t-since-fs-ts t-mark-ts">(parallelism TS)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../language/concepts.html" title="cpp/language/constraints">Concepts</a> <span class="t-mark-rev t-since-concepts-ts t-mark-ts">(concepts TS)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="concurrency.html" title="cpp/experimental/concurrency">Extensions for concurrency</a> <span class="t-mark-rev t-since-concurrency-ts t-mark-ts">(concurrency TS)</span> </td></tr>
</table></div>
<div></div>
</div></div>
</div>
<div class="t-navbar-sep"> </div>
<div class="t-navbar-head">
<strong class="selflink"> Library fundamentals</strong><div class="t-navbar-menu"><div>
<div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="optional.html" title="cpp/experimental/optional"><span class="t-lines"><span>experimental::optional</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="any.html" title="cpp/experimental/any"><span class="t-lines"><span>experimental::any</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string_view.html" title="cpp/experimental/basic string view"><span class="t-lines"><span>experimental::basic_string_view</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="sample.html" title="cpp/experimental/sample"><span class="t-lines"><span>experimental::sample</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="apply.html" title="cpp/experimental/apply"><span class="t-lines"><span>experimental::apply</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="search.html" title="cpp/experimental/search"><span class="t-lines"><span>experimental::search</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="default_searcher.html" title="cpp/experimental/default searcher"><span class="t-lines"><span>experimental::default_searcher<br>experimental::make_default_searcher</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="boyer_moore_searcher.html" title="cpp/experimental/boyer moore searcher"><span class="t-lines"><span>experimental::boyer_moore_searcher<br>experimental::make_boyer_moore_searcher</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="boyer_moore_horspool_searcher.html" title="cpp/experimental/boyer moore horspool searcher"><span class="t-lines"><span>experimental::boyer_moore_horspool_searcher<br>experimental::make_boyer_moore_horspool_searcher</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="memory.html" title="cpp/experimental/memory" class="mw-redirect"><span class="t-lines"><span>type-erased and polymorphic allocators</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="type_trait_variable_templates.html" title="cpp/experimental/type trait variable templates"><span class="t-lines"><span>variable templates for type traits</span></span></a></div></div></td></tr>
</table></div>
<div></div>
</div></div>
</div>
<div class="t-navbar-sep"> </div>
</div>
<p>The C++ Extensions for Library Fundamentals, ISO/IEC TS 19568:xxxx, defines the following new components for the C++ standard library:
</p>
<table id="toc" class="toc"><tr><td>
<div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="memory.html#optional_objects"><span class="tocnumber">1</span> <span class="toctext">optional objects</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="memory.html#class_any"><span class="tocnumber">2</span> <span class="toctext">class any</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="memory.html#string_view"><span class="tocnumber">3</span> <span class="toctext">string_view</span></a></li>
<li class="toclevel-1 tocsection-4">
<a href="memory.html#Type-erased_and_polymorphic_allocators"><span class="tocnumber">4</span> <span class="toctext">Type-erased and polymorphic allocators</span></a>
<ul>
<li class="toclevel-2 tocsection-5"><a href="memory.html#Polymorphic_allocators_and_memory_resources"><span class="tocnumber">4.1</span> <span class="toctext">Polymorphic allocators and memory resources</span></a></li>
<li class="toclevel-2 tocsection-6"><a href="memory.html#Modified_versions_of_existing_classes_to_support_type-erased_allocators"><span class="tocnumber">4.2</span> <span class="toctext">Modified versions of existing classes to support type-erased allocators</span></a></li>
<li class="toclevel-2 tocsection-7"><a href="memory.html#Convenience_aliases_for_containers_using_polymorphic_allocators"><span class="tocnumber">4.3</span> <span class="toctext">Convenience aliases for containers using polymorphic allocators</span></a></li>
</ul>
</li>
<li class="toclevel-1 tocsection-8"><a href="memory.html#Array_support_for_shared_ptr"><span class="tocnumber">5</span> <span class="toctext">Array support for shared_ptr</span></a></li>
<li class="toclevel-1 tocsection-9"><a href="memory.html#Sampling_and_searching_algorithms"><span class="tocnumber">6</span> <span class="toctext">Sampling and searching algorithms</span></a></li>
<li class="toclevel-1 tocsection-10"><a href="memory.html#General_utilities"><span class="tocnumber">7</span> <span class="toctext">General utilities</span></a></li>
<li class="toclevel-1 tocsection-11"><a href="memory.html#Feature_test_macros"><span class="tocnumber">8</span> <span class="toctext">Feature test macros</span></a></li>
</ul>
</td></tr></table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: optional objects">edit</a>]</span> <span class="mw-headline" id="optional_objects">optional objects</span>
</h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/optional&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="optional.html" title="cpp/experimental/optional"> <span class="t-lines"><span>optional</span></span></a></div></div>
</td>
<td>   a class template representing <i>optional objects</i> <br> <span class="t-mark">(class template)</span>
</td>
</tr>

</table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: class any">edit</a>]</span> <span class="mw-headline" id="class_any"> class <code>any</code> </span>
</h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/any&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="any.html" title="cpp/experimental/any"> <span class="t-lines"><span>any</span></span></a></div></div>
</td>
<td>   a type-safe container for single values of any type <br> <span class="t-mark">(class)</span>
</td>
</tr>

</table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: string view">edit</a>]</span> <span class="mw-headline" id="string_view"> <code>string_view</code> </span>
</h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/string_view&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string_view.html" title="cpp/experimental/basic string view"> <span class="t-lines"><span>basic_string_view</span></span></a></div></div>
</td>
<td>   a non-owning reference to a string  <br> <span class="t-mark">(class template)</span>
</td>
</tr>

</table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Type-erased and polymorphic allocators">edit</a>]</span> <span class="mw-headline" id="Type-erased_and_polymorphic_allocators"> Type-erased and polymorphic allocators </span>
</h3>
<h4>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Polymorphic allocators and memory resources">edit</a>]</span> <span class="mw-headline" id="Polymorphic_allocators_and_memory_resources"> Polymorphic allocators and memory resources </span>
</h4>
<p>The entities in this section are declared in the <span class="t-lc">std::experimental::pmr</span> namespace.
</p>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/memory_resource&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="memory_resource.html" title="cpp/experimental/memory resource"> <span class="t-lines"><span>memory_resource</span></span></a></div></div>
</td>
<td>    an abstract interface for classes that encapsulate memory resources  <br> <span class="t-mark">(class)</span>
</td>
</tr>
 

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="http%3A//en.cppreference.com/mwiki/index.php" class="new" title="cpp/experimental/synchronized pool resource (page does not exist)"> <span class="t-lines"><span>synchronized_pool_resource</span></span></a></div></div>
</td>
<td>   a thread-safe <span class="t-lc">memory_resource</span> for managing allocations in pools of different block sizes <br> <span class="t-mark">(class)</span>
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="http%3A//en.cppreference.com/mwiki/index.php" class="new" title="cpp/experimental/unsynchronized pool resource (page does not exist)"> <span class="t-lines"><span>unsynchronized_pool_resource</span></span></a></div></div>
</td>
<td>   a thread-unsafe <span class="t-lc">memory_resource</span> for managing allocations in pools of different block sizes <br> <span class="t-mark">(class)</span>
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="monotonic_buffer_resource.html" title="cpp/experimental/monotonic buffer resource"> <span class="t-lines"><span>monotonic_buffer_resource</span></span></a></div></div>
</td>
<td>   a special-purpose <span class="t-lc">memory_resource</span> that releases the allocated memory only when the resource is destroyed <br> <span class="t-mark">(class)</span>
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="polymorphic_allocator.html" title="cpp/experimental/polymorphic allocator"> <span class="t-lines"><span>polymorphic_allocator</span></span></a></div></div>
</td>
<td>   an allocator that supports run-time polymorphism based on the <span class="t-lc">memory_resource</span> it is constructed with  <br> <span class="t-mark">(class template)</span>
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="resource_adaptor.html" title="cpp/experimental/resource adaptor"> <span class="t-lines"><span>resource_adaptor</span></span></a></div></div>
</td>
<td>   adapts an allocator into a <span class="t-lc">memory_resource</span> <br> <span class="t-mark">(alias template)</span>
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="new_delete_resource.html" title="cpp/experimental/new delete resource"> <span class="t-lines"><span>new_delete_resource</span></span></a></div></div>
</td>
<td>   returns a static program-wide <code>memory_resource</code> that uses the global <span class="t-lc">operator new</span> and <span class="t-lc">operator delete</span> to allocate and deallocate memory <br> <span class="t-mark">(function)</span> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="null_memory_resource.html" title="cpp/experimental/null memory resource"> <span class="t-lines"><span>null_memory_resource</span></span></a></div></div>
</td>
<td>   returns a static <code>memory_resource</code> that performs no allocation  <br> <span class="t-mark">(function)</span> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="get_default_resource.html" title="cpp/experimental/get default resource"> <span class="t-lines"><span>get_default_resource</span></span></a></div></div>
</td>
<td>   gets the default <code>memory_resource</code>  <br> <span class="t-mark">(function)</span> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="set_default_resource.html" title="cpp/experimental/set default resource"> <span class="t-lines"><span>set_default_resource</span></span></a></div></div>
</td>
<td>   sets the default <code>memory_resource</code>  <br> <span class="t-mark">(function)</span> 
</td>
</tr>
</table>
<h4>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Modified versions of existing classes to support type-erased allocators">edit</a>]</span> <span class="mw-headline" id="Modified_versions_of_existing_classes_to_support_type-erased_allocators"> Modified versions of existing classes to support type-erased allocators </span>
</h4>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/functional&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="function.html" title="cpp/experimental/function"> <span class="t-lines"><span>function</span></span></a></div></div>
</td>
<td>   a modified version of <span class="t-lc">std::function</span> with support for type-erased allocators  <br> <span class="t-mark">(class template)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/future&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="lib_extensions/promise.html" title="cpp/experimental/lib extensions/promise"> <span class="t-lines"><span>promise</span></span></a></div></div>
</td>
<td>   a modified version of <span class="t-lc">std::promise</span> with support for type-erased allocators  <br> <span class="t-mark">(class template)</span>
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="lib_extensions/packaged_task.html" title="cpp/experimental/lib extensions/packaged task"> <span class="t-lines"><span>packaged_task</span></span></a></div></div>
</td>
<td>   a modified version of <span class="t-lc">std::packaged_task</span> with support for type-erased allocators  <br> <span class="t-mark">(class template)</span>
</td>
</tr>

</table>
<h4>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Convenience aliases for containers using polymorphic allocators">edit</a>]</span> <span class="mw-headline" id="Convenience_aliases_for_containers_using_polymorphic_allocators"> Convenience aliases for containers using polymorphic allocators </span>
</h4>
<p><a href="lib_extensions/pmr_container.html" title="cpp/experimental/lib extensions/pmr container">Convenience aliases and alias templates</a> for containers using polymorphic allocators are provided in the <code>std::experimental::pmr</code> namespace for the following class templates in the standard library:
</p>
<div style="column-count:3;-moz-column-count:3;-webkit-column-count:3">
<ul>
<li> <span class="t-lc">std::vector</span>
</li>
<li> <span class="t-lc">std::deque</span>
</li>
<li> <span class="t-lc">std::forward_list</span>
</li>
<li> <span class="t-lc">std::list</span>
</li>
<li> <span class="t-lc">std::basic_string</span>
</li>
<li> <span class="t-lc">std::map</span>
</li>
<li> <span class="t-lc">std::multimap</span>
</li>
<li> <span class="t-lc">std::set</span>
</li>
<li> <span class="t-lc">std::multiset</span>
</li>
<li> <span class="t-lc">std::match_results</span>
</li>
<li> <span class="t-lc">std::unordered_map</span>
</li>
<li> <span class="t-lc">std::unordered_multimap</span>
</li>
<li> <span class="t-lc">std::unordered_set</span>
</li>
<li> <span class="t-lc">std::unordered_multiset</span>
</li>
</ul>
</div>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Array support for shared ptr">edit</a>]</span> <span class="mw-headline" id="Array_support_for_shared_ptr"> Array support for <code>shared_ptr</code> </span>
</h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/memory&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc-hitem">
<td>  Class
</td>
<td>  Description
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="http%3A//en.cppreference.com/mwiki/index.php" class="new" title="cpp/experimental/shared ptr (page does not exist)"> <span class="t-lines"><span>shared_ptr</span></span></a></div></div>
</td>
<td>   A modified version of <span class="t-lc">std::shared_ptr</span> that supports arrays  <br> <span class="t-mark">(class template)</span>
</td>
</tr>
 

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="http%3A//en.cppreference.com/mwiki/index.php" class="new" title="cpp/experimental/weak ptr (page does not exist)"> <span class="t-lines"><span>weak_ptr</span></span></a></div></div>
</td>
<td>   A modified version of <span class="t-lc">std::weak_ptr</span> that supports arrays  <br> <span class="t-mark">(class template)</span>
</td>
</tr>
 
</table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Sampling and searching algorithms">edit</a>]</span> <span class="mw-headline" id="Sampling_and_searching_algorithms">Sampling and searching algorithms</span>
</h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/algorithm&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="sample.html" title="cpp/experimental/sample"> <span class="t-lines"><span>sample</span></span></a></div></div>
</td>
<td>   selects n random elements from a sequence  <br> <span class="t-mark">(function template)</span>
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="search.html" title="cpp/experimental/search"> <span class="t-lines"><span>search</span></span></a></div></div>
</td>
<td>   applies a Searcher to a sequence  <br> <span class="t-mark">(function template)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/functional&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="default_searcher.html" title="cpp/experimental/default searcher"> <span class="t-lines"><span>default_searcher</span></span></a></div></div>
</td>
<td>   standard C++ library search algorithm implementation  <br> <span class="t-mark">(class template)</span>
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="default_searcher.html" title="cpp/experimental/default searcher"> <span class="t-lines"><span>make_default_searcher</span></span></a></div></div>
</td>
<td>   helper function to create a default_searcher  <br> <span class="t-mark">(function template)</span>
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="boyer_moore_searcher.html" title="cpp/experimental/boyer moore searcher"> <span class="t-lines"><span>boyer_moore_searcher</span></span></a></div></div>
</td>
<td>   Boyer-Moore search algorithm implementation <br> <span class="t-mark">(class template)</span>
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="boyer_moore_searcher.html" title="cpp/experimental/boyer moore searcher"> <span class="t-lines"><span>make_boyer_moore_searcher</span></span></a></div></div>
</td>
<td>   helper function to create a boyer_moore_searcher  <br> <span class="t-mark">(function template)</span>
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="boyer_moore_horspool_searcher.html" title="cpp/experimental/boyer moore horspool searcher"> <span class="t-lines"><span>boyer_moore_horspool_searcher</span></span></a></div></div>
</td>
<td>   Boyer-Moore-Horspool search algorithm implementation  <br> <span class="t-mark">(class template)</span>
</td>
</tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="boyer_moore_horspool_searcher.html" title="cpp/experimental/boyer moore horspool searcher"> <span class="t-lines"><span>make_boyer_moore_horspool_searcher</span></span></a></div></div>
</td>
<td>   helper function to create a boyer_moore_horspool_searcher  <br> <span class="t-mark">(function template)</span>
</td>
</tr>

</table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: General utilities">edit</a>]</span> <span class="mw-headline" id="General_utilities">General utilities</span>
</h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/utility&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="erased_type.html" title="cpp/experimental/erased type"> <span class="t-lines"><span>erased_type</span></span></a></div></div>
</td>
<td>   placeholder type for type erasure, such as in allocators <br> <span class="t-mark">(class)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/tuple&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="apply.html" title="cpp/experimental/apply"> <span class="t-lines"><span>apply</span></span></a></div></div>
</td>
<td>   calls a function to a tuple of arguments <br> <span class="t-mark">(function template)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/type_traits&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="invocation_type.html" title="cpp/experimental/invocation type"> <span class="t-lines"><span>invocation_type</span><span>raw_invocation_type</span></span></a></div></div>
</td>
<td>   deduce the implied function type of the callable object when called with the given argument types <br> <span class="t-mark">(class template)</span>
</td>
</tr>

</table>
<p>In addition, the TS provides <a href="type_trait_variable_templates.html" title="cpp/experimental/type trait variable templates">numerous <code>constexpr</code> variable templates</a> for the following type traits and other class templates in the standard library:
</p>
<div style="column-count:2;-moz-column-count:2;-webkit-column-count:2">
<ul>
<li> <span class="t-lc">std::is_void</span>
</li>
<li> <span class="t-lc">std::is_null_pointer</span>
</li>
<li> <span class="t-lc">std::is_integral</span>
</li>
<li> <span class="t-lc">std::is_floating_point</span>
</li>
<li> <span class="t-lc">std::is_array</span>
</li>
<li> <span class="t-lc">std::is_pointer</span>
</li>
<li> <span class="t-lc">std::is_lvalue_reference</span>
</li>
<li> <span class="t-lc">std::is_rvalue_reference</span>
</li>
<li> <span class="t-lc">std::is_member_object_pointer</span>
</li>
<li> <span class="t-lc">std::is_member_function_pointer</span>
</li>
<li> <span class="t-lc">std::is_enum</span>
</li>
<li> <span class="t-lc">std::is_union</span>
</li>
<li> <span class="t-lc">std::is_class</span>
</li>
<li> <span class="t-lc">std::is_function</span>
</li>
<li> <span class="t-lc">std::is_reference</span>
</li>
<li> <span class="t-lc">std::is_arithmetic</span>
</li>
<li> <span class="t-lc">std::is_fundamental</span>
</li>
<li> <span class="t-lc">std::is_object</span>
</li>
<li> <span class="t-lc">std::is_scalar</span>
</li>
<li> <span class="t-lc">std::is_compound</span>
</li>
<li> <span class="t-lc">std::is_member_pointer</span>
</li>
<li> <span class="t-lc">std::is_const</span>
</li>
<li> <span class="t-lc">std::is_volatile</span>
</li>
<li> <span class="t-lc">std::is_trivial</span>
</li>
<li> <span class="t-lc">std::is_trivially_copyable</span>
</li>
<li> <span class="t-lc">std::is_standard_layout</span>
</li>
<li> <span class="t-lc">std::is_pod</span>
</li>
<li> <span class="t-lc">std::is_literal_type</span>
</li>
<li> <span class="t-lc">std::is_empty</span>
</li>
<li> <span class="t-lc">std::is_polymorphic</span>
</li>
<li> <span class="t-lc">std::is_abstract</span>
</li>
<li> <span class="t-lc">std::is_final</span>
</li>
<li> <span class="t-lc">std::is_signed</span>
</li>
<li> <span class="t-lc">std::is_unsigned</span>
</li>
<li> <span class="t-lc">std::is_constructible</span>
</li>
<li> <span class="t-lc">std::is_trivially_constructible</span>
</li>
<li> <span class="t-lc">std::is_nothrow_constructible</span>
</li>
<li> <span class="t-lc">std::is_default_constructible</span>
</li>
<li> <span class="t-lc">std::is_trivially_default_constructible</span>
</li>
<li> <span class="t-lc">std::is_nothrow_default_constructible</span>
</li>
<li> <span class="t-lc">std::is_copy_constructible</span>
</li>
<li> <span class="t-lc">std::is_trivially_copy_constructible</span>
</li>
<li> <span class="t-lc">std::is_nothrow_copy_constructible</span>
</li>
<li> <span class="t-lc">std::is_move_constructible</span>
</li>
<li> <span class="t-lc">std::is_trivially_move_constructible</span>
</li>
<li> <span class="t-lc">std::is_nothrow_move_constructible</span>
</li>
<li> <span class="t-lc">std::is_assignable</span>
</li>
<li> <span class="t-lc">std::is_trivially_assignable</span>
</li>
<li> <span class="t-lc">std::is_nothrow_assignable</span>
</li>
<li> <span class="t-lc">std::is_copy_assignable</span>
</li>
<li> <span class="t-lc">std::is_trivially_copy_assignable</span>
</li>
<li> <span class="t-lc">std::is_nothrow_copy_assignable</span>
</li>
<li> <span class="t-lc">std::is_move_assignable</span>
</li>
<li> <span class="t-lc">std::is_trivially_move_assignable</span>
</li>
<li> <span class="t-lc">std::is_nothrow_move_assignable</span>
</li>
<li> <span class="t-lc">std::is_destructible</span>
</li>
<li> <span class="t-lc">std::is_trivially_destructible</span>
</li>
<li> <span class="t-lc">std::is_nothrow_destructible</span>
</li>
<li> <span class="t-lc">std::has_virtual_destructor</span>
</li>
<li> <span class="t-lc">std::alignment_of</span>
</li>
<li> <span class="t-lc">std::rank</span>
</li>
<li> <span class="t-lc">std::extent</span>
</li>
<li> <span class="t-lc">std::is_same</span>
</li>
<li> <span class="t-lc">std::is_base_of</span>
</li>
<li> <span class="t-lc">std::is_convertible</span>
</li>
<li> <span class="t-lc">std::ratio_equal</span>
</li>
<li> <span class="t-lc">std::ratio_not_equal</span>
</li>
<li> <span class="t-lc">std::ratio_less</span>
</li>
<li> <span class="t-lc">std::ratio_less_equal</span>
</li>
<li> <span class="t-lc">std::ratio_greater</span>
</li>
<li> <span class="t-lc">std::ratio_greater_equal</span>
</li>
<li> <span class="t-lc">std::tuple_size</span>
</li>
<li> <span class="t-lc">std::chrono::treat_as_floating_point</span>
</li>
<li> <span class="t-lc">std::is_error_code_enum</span>
</li>
<li> <span class="t-lc">std::is_error_condition_enum</span>
</li>
<li> <span class="t-lc">std::is_bind_expression</span>
</li>
<li> <span class="t-lc">std::is_placeholder</span>
</li>
<li> <span class="t-lc">std::uses_allocator</span>
</li>
</ul>
</div>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Feature test macros">edit</a>]</span> <span class="mw-headline" id="Feature_test_macros">Feature test macros</span>
</h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/optional&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_optional</div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201411</span></span></span> indicates that the optional type is supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/any&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_any</div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201411</span></span></span> indicates that the any type is supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/string_view&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_string_view</div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201411</span></span></span> indicates that basic_string_view template is supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/tuple&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_apply</div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201402</span></span></span> indicates that the tuple apply() function is supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/type_traits&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_type_trait_variable_templates</div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201402</span></span></span> indicates that variable template type traits are supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/type_traits&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_invocation_type</div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201406</span></span></span> indicates that invocation type traits are supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/functional&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_boyer_moore_searching</div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201411</span></span></span> indicates that additional searching algorithms are supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/functional&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_function_erased_allocator</div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201406</span></span></span> indicates that type-erased allocator for std::function is supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/future&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_promise_erased_allocator</div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201406</span></span></span> indicates that type-erased allocator for std::promise is supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/future&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_packaged_task_erased_allocator</div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201406</span></span></span> indicates that type-erased allocator for std::packaged_task is supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/memory&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_shared_ptr_arrays</div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201406</span></span></span> indicates that shared_ptr arrays are supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/memory_resource&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_memory_resources</div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201402</span></span></span> indicates that polymorphic memory resources are supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/algorithm&gt;</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div>__cpp_lib_experimental_sample</div></div>
</td>
<td>   a value of <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201402</span></span></span> indicates that the sample algorithm is supported  <br> <span class="t-mark">(macro constant)</span>
</td>
</tr>

</table>

<!-- 
NewPP limit report
Preprocessor visited node count: 6405/1000000
Preprocessor generated node count: 9859/1000000
Post‐expand include size: 130696/2097152 bytes
Template argument size: 41382/2097152 bytes
Highest expansion depth: 20/40
Expensive parser function count: 0/100
-->

<!-- Saved in parser cache with key mwiki1-mwiki_en_:pcache:idhash:13683-0!*!0!!en!*!* and timestamp 20150804235952 -->
</div>                    <!-- /bodycontent -->
                                        <!-- printfooter -->
                    <div class="printfooter">
                    Retrieved from "<a href="http%3A//en.cppreference.com/mwiki/index.php">http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/lib_extensions&amp;oldid=80151</a>"                    </div>
                    <!-- /printfooter -->
                                                            <!-- catlinks -->
                    <div id="catlinks" class="catlinks catlinks-allhidden"></div>                    <!-- /catlinks -->
                                                            <div class="visualClear"></div>
                    <!-- debughtml -->
                                        <!-- /debughtml -->
                </div>
                <!-- /bodyContent -->
            </div>
        </div>
        <!-- /content -->
        <!-- footer -->
        
        <!-- /footer -->
        <script>if(window.mw){
mw.loader.state({"site":"loading","user":"missing","user.groups":"ready"});
}</script>
<script src="../../../common/skin_scripts.js"></script>
<script>if(window.mw){
mw.loader.load(["mediawiki.action.view.postEdit","mediawiki.user","mediawiki.page.ready","mediawiki.searchSuggest","mediawiki.hidpi","ext.gadget.ColiruCompiler"], null, true);
}</script>
<script src="../../../common/site_scripts.js"></script>

<script type="text/javascript">
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-2828341-1']);
_gaq.push(['_setDomainName', 'cppreference.com']);
_gaq.push(['_trackPageview']);
</script><!-- Served in 0.079 secs. -->
	</body>
<!-- Cached 20150805013028 -->
</html>
